EP3210637B1 - Infusion set - Google Patents

Description

The present invention relates to systems for connecting a fluid supply to a cannula.

From the EP 0 451 040 A1 a device for introducing a catheter with a needle is known, a cover which can be pushed together over the needle is provided. The catheter can inadvertently be pulled out again as a result of smaller tensile forces acting on the catheter and lies relatively unprotected at the puncture site; please refer Fig. 1 the EP 0 451 040 A1 .

The EP 0 290 176 A1 discloses a device for inserting a cannula with a needle, the needle having to be pressed against a spring during insertion and being withdrawn into a housing by the spring force after the insertion process. Here, too, the cannula is relatively unprotected after insertion and can easily be accidentally pulled out.

From the EP 0 615 768 B1 a device for subcutaneous delivery of a medicament is known. A cannula with a needle is introduced, with an arrangement firmly connected to the cannula with an adhesive underside being applied to the skin at the same time when the cannula is introduced, which further complicates the puncturing process, which is often unpleasant for a user.

In the known devices, the cannula is either relatively unprotected against unintentional withdrawal, with a tensile force already acting on the cannula inserted into the tissue when the needle is pulled out of the cannula, or an additional device must be moved together with the cannula during the puncturing process which makes precise positioning difficult.

It is an object of the present invention to propose a device which improves the introduction of a cannula. In general, an infusion set is to be proposed which has improvements over the prior art.

This problem is solved by the subject matter of the independent patent claim. Advantageous embodiments are listed in the dependent claims.

A system according to the invention for connecting a liquid supply to a cannula comprises a base body, consisting of a base body and a plaster, the base body being applied to a first surface of the plaster, and the base body being applied to a first surface of the plaster, and wherein the The base body has at least one opening, and the plaster has a second, opposite, adhesive surface for adhering the base body to a skin site and a separate holder which is firmly connected to a cannula for administering a liquid into a tissue, the holder and the base body are configured to form a connection when the cannula is inserted through the base body into a tissue and a plug with a supply element as a device for supplying a liquid.

A device for inserting a cannula into a tissue for the preferably subcutaneous or transcutaneous administration of a liquid has a cannula which is designed either as a hard cannula so that it can be inserted into the tissue without an additional needle or another puncture element. B. can be introduced by absorbing liquid, the cannula preferably after introduction into the tissue elastic or becomes flexible. However, it is also possible to provide a known cannula, which in a known manner with z. B. a guide needle or another puncture element is introduced into the tissue. Furthermore, a protective element is provided which can accommodate the cannula before it is introduced into the tissue, the protective element preferably being designed in such a way that the tip of the cannula penetrating the tissue or a needle suitable for inserting the cannula is covered by the protective element, so that a user cannot accidentally come into contact with this tip and e.g. B. is injured by this tip. The protective element can partially or completely surround the tip of the cannula or even the entire cannula, possibly also a needle provided for introducing the cannula, in order to ensure the protective function. Furthermore, an actuating element is provided with which the cannula or the needle with cannula can be moved out of the protective element in order to e.g. B. to introduce the cannula into the tissue, it is preferred in the case of using a needle for introducing the cannula that the needle after the insertion of the cannula by the actuating element or automatically, z. B. using a spring mechanism, can be moved back into the protective element in order to minimize or exclude the risk of injury even after the cannula has been inserted. The cannula is connected to a holder which, for. B. can be provided at the distal end facing away from the cannula tip and which can be moved with the cannula and can fix the cannula in a fixed position when the cannula is inserted by z. B. this holder is latched to a base body which is fixedly arranged over the puncture site before the puncture or is generally connected to this base body. Is z. B. pulled a needle out of this after inserting the cannula, it can be ensured due to the holder connected to the cannula that when a holding force is applied to the holder, e.g. B. by connecting the holder to a base body, the pull-out force of the needle does not act directly on the cannula, ie the cannula is not loaded in the pull-out direction when it is pulled out. It is possible to relieve the cannula when pulling out a needle and to secure the cannula against unintentional pulling out by suitable holding or fastening of the holder. If a cannula is inserted without using a needle, the holder has the advantage that the inserted cannula can be secured against unintentional pulling out by the holder and, if necessary, an element connected to the holder. The puncturing process can also be carried out easily and relatively safely with the device.

Although this description speaks of “pushing out” a needle or cannula with a “pushing element”, it is noted that this is also to be understood as a pulling out with a pulling element, ie a movement can be achieved by a pulling and / or pushing force or a Tension and / or compression spring are effected.

The holder connected to the cannula is advantageously designed so that it can establish a connection with another element, preferably with a base body which, for. B. can be glued to the skin over a puncture site, this base body is advantageously arranged so that the connection with the holder takes place in the fully or almost fully extended state of the cannula. This connection can be a latching connection or any other suitable connection, with z. B. one or more grooves or indentations and / or projections or locking lips can be provided on the bracket, which enable a releasable or non-releasable fixed connection of the bracket with a suitable element.

A needle is preferably provided with which the cannula can be introduced into a tissue, the needle being advantageously surrounded by the cannula. There it is particularly advantageous to design the device in such a way that after the cannula has been inserted, the needle can preferably be completely inserted back into the protective element, e.g. B. by a movement of the actuating element and / or a spring which z. B. is compressed when inserting the cannula into the tissue and extending the needle from the protective element and generates a force which brings the needle back into its starting position in the protective element.

The device is preferably designed in such a way that it can be firmly or detachably connected to a base body and is particularly advantageously already connected to the base body in an initial state, so that the application is simplified for the user. The base body can, for. B. consist of a plaster that can be stuck to a skin site and a base body arranged thereon, on which the device for introducing the cannula is arranged. In such a configuration, the tip of the cannula or the needle can already be arranged relatively close to an outlet opening of the base body, so that, for. B. after sticking the plaster on a skin area, the cannula or needle can be inserted immediately into the skin. The tip of the cannula or needle can also protrude from the protective element without there being any risk of injury to an operator, since the tip is shielded by the surrounding base body. The through-opening provided in the base body for the tip of the cannula or needle is advantageously relatively small, preferably only slightly larger than the diameter of the cannula, in order to prevent the operator from accidentally reaching through the through-opening and thus to minimize the risk of injury. After inserting the cannula and, if necessary, withdrawing the needle into the protective element, the device can be detached from the base body again, so that, for. B. a liquid supply can be connected to the cannula.

The device for introducing the cannula can preferably be connected to the base body, particularly advantageously to the base body, by a connecting element, in particular a latching connection, which can preferably also be released again.

The protective element is preferably a frame which at least partially surrounds the cannula or the needle in the retracted state. The protective element is particularly preferably a jacket which completely surrounds the cannula or needle in the retracted state, a passage opening preferably being provided in the protective element through which the cannula or needle can be moved out of the protective element or reinserted into the protective element . This passage opening can be open and is preferably only slightly larger than the outer diameter of the cannula. It is also possible to close the passage opening by a suitable cover element, which can be moved away from the passage opening when the cannula or needle is extended or is also designed to be elastic so that, for. B. can pierce the cannula or needle.

The device is advantageously designed in such a way that the actuating element or also a needle element provided for inserting the cannula can be connected to the protective element in the retracted state after the cannula has been inserted, in particular locked, so that the needle is prevented from being accidentally pushed out of the protective element again and thus unintentional injury to an operator can be excluded.

The device, in particular the actuating element, is particularly preferably designed in such a way that, in the extended state of the cannula, the device can be released Insertion of the cannula can be prevented by a base body connected to the device. For this purpose, z. B. connected to the actuating element and displaceable transverse element can be provided, which in the extended state of the cannula z. B. prevents compression of intended for connection to the base body holding elements and thus a z. B. detachment of the device from the base body, which can only be achieved by pressing these holding elements together. In general, any arrangement or any element can be used which can offer such a security function. This can ensure that the cannula insertion device is not accidentally detached from the base body when z. B. a needle is extended from the protective element, which could lead to injury to an operator.

Preferably, a sealing element or septum for closing off the top of the cannula or a liquid space is provided in the holder, which z. B. can be penetrated by a needle and / or a liquid supply and can ensure a liquid-tight connection. If no element has been introduced into the septum, it can completely close off the access to the cannula or a liquid space above the cannula. Suitable materials for this are known in the prior art.

According to another aspect, a base body is provided which, for. B. consists of a plaster that can be stuck to a skin area and a base body arranged on it, the base body or the base body having at least one preferably detachable connecting element to which the above-described device for introducing a cannula can be attached and to which a device for feeding a fluid or a liquid can be attached, so that when the base body is attached over an insertion point of the cannula, both the device for introducing the cannula and a device for supplying a fluid together or one after the other to the same or different ones Fasteners can be attached. In this case, the device for introducing the cannula can preferably already be firmly and detachably connected to the base body in the initial state, so that the base body with the introducing device for the cannula can be attached together over an introduction point of the cannula, the introducing device after the introduction of the cannula from the base body can be detached again. It is also possible to connect the base body to the cannula insertion device only before the cannula is introduced.

The at least one connection element provided on the base body is advantageously used both for connection to the insertion device for the cannula and for connection to the device for supplying a fluid, so that, for. B. after detaching the device for introducing the cannula, the device for supplying the fluid can be attached to the same connecting element or elements that previously served to fasten the device for introducing the cannula.

Preferably, the at least one connection element provided on the base body is an element that enables a latching connection, i.e. in particular a groove and / or a latching lip or latching nose with which a latching connection can be established with the insertion device for the cannula and / or the fluid supply device.

According to one aspect of the present invention, a system is proposed with which a liquid supply can be connected to a cannula, a base body being provided which has a cannula, which is preferably already inserted into a Tissue is introduced, e.g. B. using the device described above. The main body has at least one opening which is connected to the cannula or the cannula cavity. To supply the liquid, a plug with a feed element is provided, which can be inserted into the opening of the base body so that the liquid can be fed via the feed element through the opening of the base body into the cannula cavity and thus into the tissue. According to the invention, the plug can be placed on a contact point of the base body and folded around the contact point in such a way that the feed element of the plug is guided into the opening in the base body. Such a connection or connection of the plug of a liquid supply with the cannula is advantageous because no exact positioning is required at the beginning of the connection process, ie that, for. B. in their physical performance restricted users can put the plug relatively easily on a contact point of the base body, whereby the contact point does not have to be a point in the geometric sense, but can also be designed as a contact edge with a straight or curved or angled course or as a contact surface . If such a plug z. B. applied with a contact edge or a suitable projection of the plug on a contact edge of the base body, which does not have to be done with great accuracy with respect to the contact position, so z. B. be gradually brought into the exact position by suitable guides when folding around this contact edge, so that the feed element can be inserted exactly into the opening of the base body when the plug is completely folded down. This type of connection of a plug to the base body is therefore relatively fault-tolerant with regard to the attachment of the plug to the base body and is particularly of great advantage when the cannula connected to the base body, as described above, by an insertion device for the cannula that is already firmly connected to the base body was introduced. In this case, the user only has to detach the insertion device for the cannula from the base body after the insertion of the cannula, which does not require an exact positioning process, so that the only positioning process that has to be carried out by the user is the fault-tolerant attachment of the plug to the contact point of the base body, the feed element being brought into the opening of the base body in a positionally precise manner via a suitable guide when the plug is folded.

At least one guide element is preferably provided on the base body and / or on the plug in order to guide the plug during the folding process after it has been placed against the contact point or a contact edge. As a guide element, for. B. a width-tapering groove can be provided, in which a projection engages, so that the projection is guided during the folding process along the groove in the direction of the narrower end, whereby an exact positioning of the plug can be made relative to the base body. Both the groove and the plug can be provided on the base body and / or the plug. Furthermore, it is also conceivable to provide lateral guides on the plug and / or the base body, which are funnel-shaped in order to achieve the desired positioning of the plug relative to the base body. In general, however, any arrangement is suitable which enables the plug, which is in contact with at least one contact point, to be guided during a folding process and, in the process, can be precisely positioned in the folded-down state.
The plug is preferably designed such that it can hook onto the contact point or a contact edge of the base body. In the context of the invention, hooking is understood to mean that the plug rests on one point or several points, edges or surfaces of the base body, thus creating a loose connection between the plug and the base body, which enables folding or a rotary movement around this connection. At least one degree of freedom in the movement of the Connector are restricted relative to the base body, so that after hooking the plug into the base body, a first rough positioning of the plug is carried out in relation to the base body.

Particularly preferably, the plug can be connected to the base body, e.g. B. latch, in which case suitable grooves, detents or the like can be provided. The connection or latching connection can be designed to be detachable or non-detachable.

A base body preferably has a rotatably mounted rotating part, which is preferably firmly connected to the base body. The rotating part has an opening preferably closed by a sealing element which, in a first position of the rotating part, allows the insertion of a cannula, for. B. with a needle and enables the introduction of a feed element for feeding liquid in a second rotated position. The provision of a rotating part on the base body has the advantage that, for. B. when aligning the opening of the rotating part upwards, i.e. in a direction in which the opening is on an extension of the desired position of the cannula to be introduced, the cannula can be introduced through the opening of the rotating part and through the base body directly into the tissue. After the cannula has been inserted and, if necessary, the cannula insertion device has been detached, the rotating part can be rotated so that a supply element for supplying liquid can be connected to the side or when the opening of the rotating part is not upward. A cannula can thus be introduced in a simple manner and a liquid supply can be connected at the side, so that the overall height of the device remains low when the cannula is introduced and the liquid supply is connected. The connection of the cannula with the opening of the rotating part can, for. B. be done by a flexible hose element or other suitable device, which enables a secure connection in the rotated state of the rotating part.

A device for supplying a liquid via a cannula into a tissue preferably has only a single sealing element, which serves to seal a liquid space and can be pierced by a cannula and / or a needle when the cannula is to be introduced into the tissue and by a Feed element can be penetrated when a liquid is to be fed to the liquid space. In addition, further sealing elements can of course also be provided.

A liquid can preferably be supplied to a tissue via a cannula, a cannula, optionally with a needle, being pierced through a sealing element in order to insert the cannula into the tissue. Once the cannula has been introduced, a feed element is introduced through the sealing element, optionally after removing the needle, in order to introduce a liquid into the tissue via the feed element through the sealing element and the cannula.

A device for inserting a cannula into tissue is preferably proposed, a cannula push-out device being provided for pushing out the cannula and inserting the cannula into tissue. A retraction element is coupled to the cannula ejection device in order to retract the cannula ejection device after the cannula has been ejected. The retraction element is preferably a spring, which can be pretensioned, for example, so that the energy or force stored in the spring is sufficient to withdraw the cannula ejection device from the extended state, a complete retraction into the initial state being possible but not necessary. Thus, the application of a Cannula can be automated and thus simplified. By suitable selection of the parameters of the retraction element, such as a spring length and a spring constant, the retraction process of the cannula ejection device can be carried out safely, that is, if these parameters are selected correctly, sufficient force is always available to safely retract the retraction element without a user must use great force manually.

The cannula ejection device is preferably a guide needle or some other element carrying the cannula. So z. B. a cannula without a guide needle can be introduced using a suitable cannula holder.

A spring is preferably provided as the retraction element, it also being possible to use other energy or force-storing elements in order to retract the retraction element again after the cannula has been introduced.

Preferably, a trigger element is provided for the retraction element, which z. B. can be operated manually or is triggered automatically in a certain state of the cannula insertion device. As a manual trigger element, for. B. a push button or another suitable switching or sliding element can be provided with which a fuse of the retraction element can be unlocked. As a backup z. B. a retraction element blocking the retraction direction can be provided, which when the fuse is triggered, z. B. by pressing a push button, is moved so that a retraction force is applied to the cannula ejector via the retraction element in order to retract it. The holding element can, for. B. a laterally displaceable element such. B. be a pin or an edge and can e.g. B. can also be moved via a tilting or folding mechanism.

The triggering element for the retraction element can advantageously be triggered automatically when the cannula insertion device is in a certain state. For example, a mechanism can be provided which automatically initiates the retraction process of the cannula ejection device when e.g. B. the cannula insertion device is removed from a base body. For this purpose, z. B. a cam can be provided on the base body, which automatically actuates a trigger mechanism for the retraction element when the cannula insertion device is removed from the base body.

A push-out element, e.g. B. a spring can be provided which can generate sufficient force to introduce the cannula into the tissue. The push-out element can be secured as described above for the retraction element and z. B. can also be triggered by a push button. If both a retraction element and an extension element are provided, a fully automatic cannula insertion device can be created, since a user does not have to actively use force either to insert a cannula or to withdraw a cannula extension device. The introduction of a cannula z. B. with a guide needle and the retraction of the guide needle is thus fully automated, so that the risk of incorrect use by users is reduced.

The device for inserting a cannula into tissue can advantageously be designed so that a single energy-storing element, such as. B. a spring or a plurality of interacting energy-storing elements can be used as an energy-storing unit to a cannula ejector or Moving the needle, preferably after suitable positioning, automatically, ie without supplying external energy, in such a way that the needle is inserted into the tissue and the needle push-out device is then withdrawn again automatically after the needle has been inserted into the tissue without any external force or energy supply, so that a user, apart from triggering the respective extension and retraction processes, essentially does not have to use any force. When using a single energy-storing device, such as a compression spring, it is advantageous to arrange the spring in the initial state, ie before the cannula is inserted into the tissue, in a tensioned state so that during a first partial relaxation or partial expansion of the spring in a first direction, For example, to push the cannula push-out device or needle downwards out of the cannula push-in device, the cannula push-out device or needle is moved out of the cannula push-button device so that the cannula or a cannula assembly can be placed in or on a tissue as desired, with a second partial expansion of the spring into a second direction, preferably opposite to the first direction, the cannula ejection device or needle is withdrawn again so that the cannula or the cannula assembly can remain in the tissue and the cannula insertion device with preferably completely retracted cannula The ejector or needle can be removed. Instead of a spring, which can be made of metal or plastic, for example, other elements can also be used as the energy store, which for example store compressed air, are based on electrical, magnetic or other principles.

A single triggering element, such as a button, switch, folding mechanism, sliding mechanism, latching mechanism, rotating mechanism, rotary knob or lever, is preferably provided, with which the pushing-out process and the retracting process of the cannula ejector or needle can be triggered depending on the position. For example, a button can be provided in the form of a retractable or pushable element, which z. B. after performing an unlocking process, a first section is pressed to trigger the push-out process and a second section of the same or different length is pressed in the same direction to trigger the retraction process. Alternatively, it is also possible that one trigger element is actuated in a first direction to trigger the ejection process and the cannula ejection device or needle is moved in a second direction to trigger the retraction process, which is different from the first direction, e.g. B. a movement in the opposite direction. Thus, with a single release element, such as a push button, by pressing the push button z. B. in a single direction successively first the introduction of the cannula into tissue through the cannula ejector or needle and then the withdrawal of the needle from the introduced cannula or cannula assembly can be initiated, whereby the cannula insertion device can be operated very easily.

In general, a release element can also be designed as a rotating mechanism or rotary knob, whereby an extension process can be triggered by a rotation and a retraction process is triggered with a further rotation in the same or alternatively in the opposite direction. Combinations of different release elements are also possible, for example to trigger an extension process with a push button or switch and, for example, to trigger a retraction process with a rotary knob. A release element for the retraction is advantageously only released after it has been pushed out.

At least one securing element can advantageously be provided on the cannula insertion device, which prevents unintentional actuation of a release element. Such a securing element is designed, for example, in such a way that it must be removed from the cannula insertion device or brought into an unlocked state on the cannula insertion device in order to be able to actuate the release element at all. For example, the securing element can be configured as a securing cap which at least partially and preferably approximately completely surrounds the triggering element and protects it from unintentional contact and thus undesired triggering. Furthermore, the securing element can also be designed as a device for locking or arresting the triggering element which, for example, first has to be moved in order to be able to actuate the triggering element. It is advantageous to design the securing element so that it is not simply z. B. can be moved by accidental contact or a shock, but can be brought into a state in which the trigger element can be actuated, for example, only by a pressure movement between two fingers. The securing element can be designed in such a way that it either requires constant pressure or tension to put the release element in the unlocked state, or that it remains in the unlocked state after an unlocking process has been carried out and, for example, engages, so that after unlocking the Trigger element can be actuated.

The cannula insertion device can be designed as a disposable device, the retraction element and / or extension element contained therein already being prestressed in order to bring about an automatic insertion of the cannula and / or an automatic retraction of the cannula extension device. The cannula insertion device can, however, also be designed as a reusable cannula insertion device, the retraction element and / or the push-out element being designed as loadable or tensionable. So z. B. a mechanism can be provided to re-tension a return spring and / or an extension spring after a cannula has been inserted and / or a cannula ejector has been withdrawn, so that the cannula insertion device can be used to insert a further cannula.

In general, the cannula insertion device can be designed to be fully automatic, that is to say both an extension element for the cannula and a retraction element can be provided. Alternatively, it is also possible to provide only one of these two elements in order to create a semi-automatic cannula insertion device, the other process then having to be carried out manually. It is Z. B. possible to automate only the introduction of the cannula by providing a push-out element, the withdrawal of the cannula push-out device then having to be carried out manually.

All of the described embodiments of an infusion set or a cannula insertion device and / or a liquid supply device can, in contrast to the locking connections described above by way of example, for connecting the respective devices to a base body also have a rotary or screw connection, which can preferably lock in one or more positions so that the respective devices can be connected to one another or released from one another by turning and the latching devices described can be dispensed with.

The devices described above in accordance with the individual aspects can be used both independently of one another and in combination with elements in accordance with other aspects.

Figur 1

eine erste Ausführungsform eines Infusionssets einer an einem Basiskörper angebrachten Vorrichtung zum Einbringen der Kanüle;

Figur 2

die Vorrichtung nach Figur 1, wobei die Kanüleneinbringvorrichtung vom Basiskörper losgelöst ist;

Figur 3

eine Teilschnittansicht des Basiskörpers mit eingebrachter Kanüle;

Figur 4

eine Querschnittsansicht einer Flüssigkeitszuführvorrichtung;

Figur 5

eine Teilquerschnittsansicht der in den Basiskörper einzubringenden Flüssigkeitszuführvorrichtung;

Figur 6

die Anordnung nach Figur 5 mit an dem Basiskörper angesetztem Stecker der Flüssigkeitszuführvorrichtung;

Figur 7

die Anordnung von Figur 6 aus einem anderem Blickwinkel;

Figur 8

eine alternative Ausführungsform mit Drehteil;

Figur 9

eine Ausführungsform einer automatischen Kanüleneinbringvorrichtung im Ausgangszustand;

Figur 10

die in Figur 9 gezeigte Kanüleneinbringvorrichtung nach Einbringen der Kanüle;

Figur 11

die in Figur 10 gezeigte Kanüleneinbringvorrichtung nach Rückziehen der Führungsnadel;

Figur 12

die in Figur 11 gezeigte Kanüleneinbringvorrichtung nach Abtrennung von dem Grundkörper;

Figur 13

eine erste Ausführungsform einer automatischen Kanüleneinbring- und Rückzugsvorrichtung im Ausgangszustand;

Figur 14

die Vorrichtung von Figur 13 nach Einbringen der Kanüle;

Figur 15

die in Figur 14 gezeigte Vorrichtung nach Rückziehen der Führungsnadel;

Figur 16

eine zweite Ausführungsform einer automatischen Kanüleneinbring- und Rückzugsvorrichtung im Ausgangszustand;

Figur 17

die in Figur 16 gezeigte Vorrichtung nach Einbringen der Kanüle; und

Figur 18

die in Figur 17 gezeigte Vorrichtung nach Rückziehen der Führungsnadel.

The invention will be described below on the basis of preferred exemplary embodiments with reference to the drawings. Show it:

Figure 1

a first embodiment of an infusion set of a device attached to a base body for introducing the cannula;

Figure 2

the device after Figure 1 wherein the cannula insertion device is detached from the base body;

Figure 3

a partial sectional view of the base body with inserted cannula;

Figure 4

a cross-sectional view of a liquid supply device;

Figure 5

a partial cross-sectional view of the liquid supply device to be introduced into the base body;

Figure 6

the arrangement according to Figure 5 with the plug of the liquid supply device attached to the base body;

Figure 7

the arrangement of Figure 6 from a different angle;

Figure 8

an alternative embodiment with a rotating part;

Figure 9

an embodiment of an automatic cannula insertion device in the initial state;

Figure 10

in the Figure 9 Cannula insertion device shown after insertion of the cannula;

Figure 11

in the Figure 10 Cannula insertion device shown after retraction of the guide needle;

Figure 12

in the Figure 11 Cannula insertion device shown after separation from the base body;

Figure 13

a first embodiment of an automatic cannula insertion and withdrawal device in the initial state;

Figure 14

the device of Figure 13 after inserting the cannula;

Figure 15

in the Figure 14 Device shown after retraction of the guide needle;

Figure 16

a second embodiment of an automatic cannula insertion and withdrawal device in the initial state;

Figure 17

in the Figure 16 Device shown after insertion of the cannula; and

Figure 18

in the Figure 17 Device shown after retraction of the guide needle.

Figure 1 shows an infusion set with a cannula insertion device 3 - 8 firmly pre-assembled on the base body 1, 2. The base body consists of a base body 1 and a plaster 2, which has a lower adhesive surface in order to be able to glue the base body over an injection site. The base body 1 is arranged on the upper side of the plaster 2; z. B. glued on, which is firmly connected by the holder 6a to the cannula insertion device 3-8. The cannula insertion device has a guide needle 8 which is passed through the cannula 3 and with which the cannula 3 can be introduced from the underside of the base body 1 into a tissue. At the top of the cannula 3, ie the side of the cannula 3 facing away from the tip of the guide needle 8, a holder 5 is firmly connected to the cannula 3, in the holder 5, as in FIG Figure 3 shown, a sealing element or septum 4 is provided. The guide needle 8 and the cannula 3 are surrounded by the guide element 6 serving as a protective element, so that on the one hand there is no risk of injury to an operator, since the tip of the guide needle 8 does not protrude from the arrangement shown and is still arranged within the base body 1 or the guide element 6 is. On the other hand, the in Figure 1 The arrangement shown largely prevents contamination of the guide needle 8 and the cannula 3 before the cannula 3 is introduced into tissue, since direct contact of the cannula 3 and guide needle 8 with the environment is prevented by the guide element 6 and the base body 1. The guide needle 8 is, as in Figure 2 shown, firmly connected to the actuating element 7 and can be pushed downward out of the base body 1 by pressing the actuating element 7 in order to insert the cannula 3 into a tissue.

Figure 2 shows the arrangement of Figure 1 after inserting the cannula 3 and releasing the connection between the cannula insertion device and the base body. By pressing the actuating element 7 downwards, the guide needle 8 was moved downwards together with the cannula 3 and the cannula 3 was introduced into a tissue (not shown) lying under the plaster 2. The holder 5, which is firmly connected to the cannula 3 at the top of the cannula 3 and has an internal sealing element 4, was pushed into the base body 1 until an annular projection 1d of the base body 1 engages in a groove 5a running around the holder 5 and thus a Latching of the holder 5 in the base body 1 causes. After the holder 5 has latched into the base body 1, the guide needle 8 can be pulled out of the cannula 3 by moving the actuating element 7 upwards, without excessive force acting on the inserted cannula 3 during this pulling process of the guide needle 8 from the cannula 3 . The locking of the holder 5 in the base body 1 causes the holder 5 to be firmly anchored in the base body 1 when there is an upward force on the guide needle 8 relative to the guide element 6 which is still connected to the base body 1 during the pull-out process, and thus a strain relief the cannula 3 is made possible during the withdrawal process of the needle 8.

The holder 5 can, for example, have a surface structure or one or more outwardly protruding elements on the outer surface that is guided inside the guide element 6, which allow movement of the holder 5 in the extension direction, but prevent or impede movement in the retraction direction, see above that incorrect operation can be prevented. Correspondingly, corresponding structures or elements can be provided on the inside of the guide element 6 in order to enable a movement only in a predetermined direction.

If the holders 6a of the guide element 6 are moved by compressing the actuating elements 6b in such a way that the latching lugs 6c of the guide element 6 no longer engage the latching lugs 1a of the base body 1, the cannula insertion device can be detached from the base body 1. The actuating element 7 is firmly locked in its outermost upper position by a circumferential groove 7a in the lower region of the actuating element 7 with a circumferential projection 6d of the guide element 6 and thus ensures that after the cannula insertion device is disconnected, the guide needle 8 is no longer unintentionally out of the Guide element 6 can be pushed out. How out Figure 1 As can be seen, in the pre-assembled basic state of the cannula insertion device on the base body 1, the actuating element 7 is retracted so far into the guide element 6 that the circumferential groove 7a of the actuating element 7 is positioned below the circumferential projection 6d, so that the actuating element 7 is locked to the Guide element 6 only takes place after the cannula 3 has been introduced.

Figure 3 shows in partial section the inserted cannula 3 with the holder 5 latched in the base body 1, in which a sealing element 4 is arranged.

Figure 4 shows a sectional view of the in Figure 1 shown plug 9 of the liquid supply device. The coupling part 13 of the hose 12 is connected to a liquid delivery device (not shown). Then the entire liquid space of the coupling part 13, the hose 12 and the plug 9 is flooded. The plug has a plug cannula 10 which is connected to the hose 12 through the channel 9a running in the plug 9. The plug 9 is brought into a position above the base body 1, as in FIG Figure 5 and brought into contact with the edge 1b of the base body 1 with the edge 9b running on the rear lower side of the plug 9. Here, the plug 9 is preferably tilted slightly upwards, as in FIG Figure 6 shown, so that the edge 9b protruding from the plug 9 is introduced into the gap defined by the top of the base body 1 and the protruding edge 1c of the base body 1. The plug 9 can thus be brought into a first contact position with respect to the base body 1 in a relatively simple and user-friendly manner. If the edge 9b of the plug 9 engages in the gap defined by the edge 1c of the base body 1, the plug 9 can be folded down around the pivot point defined by this engagement, around the plug cannula 10 into the housing 5 through the sealing element 4 and thus to enable a flow of a liquid from the liquid delivery device through the coupling part 13, the hose 12, the plug 9 and the plug cannula 10 into the cannula 3 and thus into the surrounding tissue.

If the connector 9 from the Figures 6 and 7th When the position shown is folded down, the plug 9 is guided via guide cams 14 in order to introduce the plug cannula 10 into the housing 5 in a precisely positioned manner. Due to the guidance by means of the guide cams 14, a possible lateral offset of the plug 9 relative to the base body 1 when the plug 9 is folded up when the plug 9 is attached to the edge 1b of the base body 1 can be corrected so that the plug cannula 10 is always safely in the housing 5 can be introduced.

In the completely folded down state of the plug 9, in which the plug cannula 10 is inserted into the housing 5, the latching devices 15 provided on the side of the plug 9 engage with the in Figure 2 locking lugs 1b of the base body 1 shown, whereby the plug 9 is securely connected to the base body 1.

Figure 8 shows an alternative embodiment. A rotating part 16 rotatably mounted in the base body 1 can be brought into a position in which the opening 18 of the rotating part 16 faces upwards. In this position, a cannula can be introduced into the base body 1 with the aid of the guide needle 8 protected by a frame serving as a protective element 6, as described above. After inserting the cannula, the guide needle 8 can be removed again. The rotating part 16 can now, as in Figure 8 shown, are rotated to the side and preferably latches with an upwardly pointing latching lug 17 attached to the base plane of the base body 1, as a result of which the rotating part 16 is securely held in its folded-down position. In this alternative embodiment, a plug 9 can be attached to the side of the completely folded down rotating part 16 so that the plug cannula 10 running in a straight extension of the hose 12 can be inserted into the opening 18 of the rotating part 16 facing the side. A latching device 15 attached to the plug 9 can latch with suitable counterparts of the rotating part 16.

In the embodiments described above, the plug 9 can again be disconnected from the base body 1 again by lateral pressure on the areas above or to the side of the latching devices 15 of the plug 9. After the disconnection has taken place, the sealing element 4 completely closes the access to the cannula 3 again.

Figure 9 shows an automatic cannula delivery device. With regard to the description of the base body 1 with associated latching connections and the introduction of the cannula 3 with holder 5 and sealing element 4, reference is made to the description above. Provided in the guide element 6 is a needle carrier 27 which is movable in the longitudinal direction of the guide element 6 and which is fixedly connected to the guide needle 8. Alternatively, the guide needle 8 can also be designed so that it can be coupled to the needle carrier 27 in order to, for. B. to change the guide needle 8. The needle carrier 27 is in a retracted state and is pretensioned by an insertion spring 21 lying on the front side of the needle carrier 27, which is supported against a support element 20 provided approximately in the middle part of the guide element 6 and the needle carrier 27 secured by the holding element 28a in the extension direction of the Cannula 3 pretensioned. The holding element 28a can be unlocked by a first release button 24. On the opposite side of the support element 20, a return spring 22 is provided which presses against a retaining ring 23 secured by a retaining element 28b, which can be unlocked by a second release button 25. The needle carrier 27 extends in the longitudinal direction of the guide element 6 through the two springs 21 and 22, as well as the support element 20 and the retaining ring 23, and has a retaining element 27a at its rear end to prevent the needle carrier 27 from passing through the retaining ring 23 can pass completely. If the release button 24 is pressed, the schematically drawn holding element 28a is pushed or folded radially outward in the direction of the arrow, the folding mechanism preferably being formed entirely within the guide element 6, the needle carrier 27 then no longer being held in the direction of extension of the cannula 3 and is accelerated downward by the force of the insertion spring 21 in order to eject the cannula 3 from the guide element 6 with the guide needle 8 and to introduce it through the plaster 2 into a tissue. The ejection movement is continued until the holding element 27a of the needle carrier 27 rests on the holding ring 23.

Figure 10 shows the in Figure 9 The cannula insertion device shown after the pushing-out process of the cannula 3 has taken place. The insertion spring 21 has transferred the energy stored in it to the needle carrier 27 and is in the relaxed state. The bracket 5 can, for. B. be locked to the base body 1 as described above. If the user now actuates the second release button 25, the radially displaceable retaining element 28b ( Fig. 9 ) is pushed out of the retaining ring 23 and the retaining ring 23, which was previously secured against axial movement in the guide element 6, is released, so that the return spring 22 presses against the retaining ring 23 and the retaining element 27a of the needle carrier 27 and thus a retraction force acts on the needle carrier 27 . In the embodiment shown, the return spring 22 is preferably designed in such a way that it can apply a stronger force than the insertion spring 21, since it is compressed again when the needle carrier 27 is withdrawn. Alternatively, the needle carrier 27 can also be designed so that after the cannula 3 has been inserted, there is no longer any coupling between the lower side of the needle carrier 27 and the insertion spring 21, so that the insertion spring 21 no longer has to be tensioned when the needle carrier 27 is withdrawn.

In general, the holding element 28a and / or the holding element 28b can be designed as a tilting or sliding mechanism or as any other safety mechanism.

Figure 11 shows the in Figure 10 The cannula insertion device shown here after the needle carrier 27 has been withdrawn. The guide needle 8 was withdrawn from the pushed out cannula 3 and inserted into the guide element 6 in order to avoid injuries.

Alternatively to the embodiment shown, z. B. the withdrawal of the needle carrier 27 take place fully automatically after insertion of the cannula 3 by z. B. a release mechanism for the return spring 22 is actuated by the underside of the needle carrier 27, whereby immediately after the introduction of the cannula 3 of the needle carrier 27 is withdrawn again. In this case, the second release button 25 can then be omitted.

According to a further alternative embodiment, the return spring 22 can be triggered automatically by releasing the retaining ring 23 when the cannula insertion device is removed from the base body 1, e.g. B. by pressing the buttons 6b to release the latching of the locking lugs 6c of the guide element 6 with the locking lugs 1a of the base body 1, the retaining ring 23 is unlocked at the same time.

The cannula insertion device is advantageously designed in such a way that the locking between the guide element 6 and the base body 1 cannot be released when the guide needle 8 is in the position shown in FIG Figure 9 positions shown before extension and / or in the in Figure 10 extended position shown. This can e.g. B. be done in that the underside of the needle carrier 27 is so wide that a compression of the underside of the guide element 6 z. B. is prevented on the buttons 6b and in the in Figure 10 The position shown thus the locking between the guide element 6 and the base body 1 cannot be released.

Figure 12 shows the cannula insertion device detached from the base body 1 with the guide needle 8 withdrawn. The cannula insertion device can now be safely disposed of, since the guide needle 8 is covered by the surrounding guide element 6 and the risk of unintentional puncture injuries is thus minimized. Alternatively, the cannula insertion device can be returned to the FIG Figure 9 are brought state shown by z. B. the retaining ring 23 is pushed from the upper position back into a lower position, the return spring 22 again is excited. It is also possible to push the needle carrier 27 out of the guide element 6 and thereby tension the return spring 22, the insertion spring 21 then being tensioned again in a second step. In the case of a reusable device, the used guide needle is preferably exchanged and replaced by a new guide needle, if necessary with a new cannula 3 and associated holder 5 with sealing element 4.

Figure 13 shows a first embodiment of an automatic cannula insertion and retraction device in the initial state before the insertion of a cannula 3 on a cannula assembly 35 through a guide needle 8. The cannula insertion device has a connector sleeve or a guide element 38, which has connector elements 39 at its lower end, for example to be attached to a base or base body 1, as shown for one of the embodiments in the preceding figures. These connector elements 39 for connecting the connector sleeve 38 to a predetermined base body have, for example, latching tongues 39a and other connecting elements (not shown). Inside the connector sleeve 38, the guide sleeve 33 is provided with tongues 33a, 33b and 33c projecting inward therefrom. The tongues 33a to 33c are arranged at different positions in the axial direction of the guide sleeve 33 and can be arranged as individual protruding elements or also over a larger part of the circumference of the guide sleeve 33. The tongues can, for example, also lie opposite one another and / or be designed symmetrically to one another as a plurality of individual tongue elements. The three tongues 33a to 33c shown by way of example are arranged offset from one another in the axial direction of the guide sleeve 33 in order to fulfill various functions when triggering an extension and retraction process, as will be explained below. Inside the guide sleeve 33, a release sleeve 37a is provided which is fixedly connected to the release button 37 and which has recesses in the axial direction which are assigned to the tongues 33b and 33c. Furthermore, special release surfaces, such as bevels, are provided on the release sleeve 37a in order to protect the tongues 33a to 33c when the release sleeve 37a is moved downward in the position shown in FIG Figure 13 shown embodiment to push away in a predetermined order, whereby the extension and retraction process of the cannula assembly 35 is initiated. A needle part or needle carrier 34 is also displaceably arranged within the connector sleeve 38, which is coupled to the cannula assembly 35 via a fixedly connected guide needle 8 and preferably a direct contact surface or is latched to it via a latching device (not shown). In the initial state shown, the fully pretensioned spring 31 presses on the cannula assembly 35, a pair of tongues 33b symmetrically arranged above the spring 31 and a pair of tongues 33a of the guide sleeve 33 arranged below the cannula assembly 35 in the pretensioned spring 31 pressing on the cannula assembly 35 Hold position. On the top of the connector sleeve 38 there is a securing bracket 38a with a hole 38b provided therein, the diameter of the hole 38b roughly corresponding to the diameter of the release button 37 and preferably a little larger in order to allow the release button 37 to pass through easily. The approximately L-shaped securing clip 38a lies opposite a securing clip 38c with an elastic element on the upper side of the connector sleeve 38, wherein a tongue 38d provided on the securing clip 38a can latch with the securing clip 38c when the securing clip 38a and the securing clip 38c are pressed together will. In the Figure 13 The bore 38b shown eccentrically to the cannula axis prevents the release button 37 from being pressed. If the safety bracket 38a and the safety bracket 38c are pressed together so that the safety bracket 38c z. B. with the Tongue 38d engages, the bore 38b is brought into a position concentric to the position of the release button 37, so that it can be pressed.

Figure 14 shows the state of the in Figure 13 device shown after the actuating button 37 has been pressed in by about half a length. The lower tongues 33a, onto which the cannula assembly 35 was pressed by the spring 31, are deformed by the release sleeve 37a extending along the inside of the connector sleeve 38, whereby the cannula assembly 35 is released together with the needle carrier 34 and from the spring 31 to one lower end stop, which can be provided in the cannula insertion device or on a base body 1, is pressed. The upper end of the needle carrier 34 leads over the tongues 33c. The cannula 3 of the cannula assembly 35 connected to the guide needle 8 is pushed out of the device preferably at high speed by the force of the spring 31 and can be introduced into a tissue as desired.

In the in Figure 14 In the position shown, the cannula assembly 35 is locked to a base body or base body (not shown) of an infusion set and the needle carrier 34 is unlocked by tongues in the base body of the infusion set so that the needle carrier 34 and cannula assembly are no longer connected (in Figure 14 Not shown). The needle carrier 34 is locked in this position by the two tongues 33c arranged symmetrically to one another, which makes it possible to reposition the set.

The spring 31 in the semi-relaxed state presses at the bottom against the ejected cannula assembly 35 and rests on the opposite side against a protruding element of the needle part 34, the needle part 34 being secured against axial displacement by the tongues 33c. The spring 31 is held in the position shown by the tongues 33b. In general, the spring can also be held in the position shown by the upper end of the needle part 34, for example.

Figure 15 FIG. 8 shows the state of the device of FIG Figure 14 after the operating button 37 has been pushed in completely. As a result, the release sleeve 37a is pushed over the tongues 33b and 33c, which are pushed outward and thus release the needle part 34, which is pushed back into the connector sleeve 38 by the spring 31, which can now fully relax. As a result, the guide needle 8 connected to the needle part 34 is withdrawn from the cannula 3 and the cannula assembly 35 into the connector sleeve 38, the cannula 3 z. B. can remain in a tissue. The needle part 34 is kept in the retracted position by the spring 31, so that the guide needle 8 cannot unintentionally emerge from the connector sleeve 38, which minimizes the risk of injury. The connector sleeve 38 can now be removed from a base body by releasing the connector elements 39.

Figure 16 shows a second embodiment of an automatic cannula insertion and retraction device in the initial state with a connector sleeve 38 which is connected to a base body 1. A release button 37 merges into the release sleeve 37a, which is arranged inside the connector sleeve 38. The release sleeve 37a has depressions and lower and upper bevels along its axial direction on the inside, with which, when the release sleeve 37a is axially displaced within the connector sleeve 38, a lower and an upper driver ring 32a and 32b can be decoupled in order to remove the guide needle 8 from the The connector sleeve 38 is pushed out together with the cannula 3 with the associated cannula assembly 35 arranged around it and then withdrawing the guide needle 8 from the cannula 3 and the cannula assembly 35, as will be described below.

The lower driver ring 32a rests on a stop sleeve 36 and is held in position by this against the pressure of the spring 31. The spring 31 presses on the top against the upper driver ring 32b, which by the guide sleeve 33 z. B. is held in a groove or recess. The needle carrier 34 is designed so that it can be moved in the axial direction of the connector sleeve 38 through the driver rings 32a and 32b to the end of the needle carrier 34, which has a larger diameter than the inner diameter of the driver rings, in order to prevent the Needle carrier 34 can fall out, for example. The needle carrier 34 is in turn firmly connected to the guide needle 8.

Figure 17 shows the in Figure 16 The device shown after the safety cap 38d arranged above the release button 37 has been removed and the release button 37 has been pressed in by about half a length. The lower driver ring 32a is displaced laterally away from the stop sleeve 36 by a lower inclined inner surface of the release sleeve 37a and is thus decoupled from it. The lower driver ring 32a can either already be coupled to the needle carrier 34 or be coupled to the needle carrier 34 by this displacement process. The spring 31 now presses against the upper driver ring 32b, which is still firmly held by the guide sleeve 33, and presses the lower driver ring 32a, which is coupled to the needle carrier 34, downwards and thus brings the guide needle 8 together with the cannula 3 into a tissue lying below the base body 1 again, the cannula assembly 35 is moved to a lower end stop. In this position, the needle carrier 34 remains locked to the base body 1, which makes it possible to relocate the entire set.

Figure 18 shows the state of the in Figure 17 shown device after the release button 37 has been pressed further. First, the needle carrier 34 is completely unlocked from the cannula assembly 35. The upper driver ring 32b is laterally displaced by an upper inclined surface of the release sleeve 37a and is thus decoupled from the guide sleeve 33 and coupled into the needle carrier 34, so that the spring 31 pushes the needle carrier 34 upwards via the upper driver ring 32b to an upper end stop can. As a result, the guide needle 8 is withdrawn from the cannula 3 and the cannula assembly 35 and is held in the retracted position by the spring 31 pressing against the needle carrier 34, whereby the risk of injury is minimized. In general, one or more actuating elements, eg. B. buttons can be provided, which directly or indirectly, z. B. via a displacement of an element in the cannula insertion device, the corresponding process z. B. by releasing a spring, trigger.

Claims (11)

1. System for connecting a fluid supply with a cannula, comprising:

   a base body consisting of a main body (1) and a sticking plaster (2), wherein the main body is placed on a first surface of the sticking plaster, and wherein the main body has at least one opening, and the sticking plaster has a second, adhesive surface on the opposite side for sticking the base body to an area of skin; and

   a separate mounting (5, 35) which is fixedly connected to a cannula (3) for introducing a fluid into a tissue; wherein the mounting and the main body are configured so as to create a connection when the cannula is introduced into a tissue through the main body;

   and a plug (9) with a feed element (10) as an apparatus for supplying a fluid.
2. System according to Claim 1, characterized in that the apparatus for supplying a fluid can be connected to the main body via connector elements, wherein the connection is designed to be detachable.
3. System according to Claim 2, characterized in that the connector elements are designed to form a connection both with an insertion apparatus for the cannula and a connection with the apparatus for delivering a fluid.
4. System according to any one of the preceding claims, characterized in that the feed element can be introduced into the opening in the main body so that the fluid can be transported through the opening in the main body via the feed element, and into the cannula cavity.
5. System according to Claim 4, characterized in that the plug can be placed on a contact point, a contact edge with straight or curved or angled alignment or on a contact surface of the main body and is designed such that it can be folded around them.
6. System according to any one of the preceding claims, characterized in that a guide element is provided on the main body and/or on the plug.
7. System according to any one of the preceding claims, characterized in that the plug can be connected to the main body by means of detent connection, wherein preferably suitable grooves or detent lugs are provided.
8. System according to Claim 7, characterized in that the detent connection is designed to be detachable or non-detachable.
9. System according to any one of Claims 1 to 3, characterized in that the main body has a rotatably mounted rotary member, which is preferably fixedly connected to the main body.
10. System according to Claim 9, characterized in that the rotary member has an opening which is preferably closed by a sealing element, and into which a cannula can be inserted in a first position of the rotary member, and in a second, rotated position of the rotary member a feed element of an apparatus device can be attached for supplying a fluid.
11. System according to Claim 10, characterized in that the feed element can be connected laterally to the rotary member in the second, rotated position when the opening is not facing upwards.

Images